Missing Addend

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Answer Key & Explanations

Missing Addend · Grade 1 · Worksheet 3

1. Emma has 7 stickers in her collection. She wants to have 12 stickers in total. How many more stickers does Emma need to get? Answer: 5 Solution: Emma starts with 7 stickers She wants to have 12 stickers total To find how many more she needs, subtract what she has from what she wants: 12 - 7 12 - 7 = 5 Emma needs 5 more stickers.
   Full step-by-step solution

   Step 1: Emma starts with 7 stickers Step 2: She wants to have 12 stickers total Step 3: To find how many more she needs, subtract what she has from what she wants: 12 - 7 Step 4: 12 - 7 = 5 Emma needs 5 more stickers.

2. 9 + ? = 16 Answer: 7 Solution: We know that 9 plus some number equals 16. To find the missing number, we can think: 16 - 9 = ? 16 - 9 = 7 Check: 9 + 7 = 16, which is correct.
   Full step-by-step solution

   Step 1: We know that 9 plus some number equals 16. Step 2: To find the missing number, we can think: 16 - 9 = ? Step 3: 16 - 9 = 7 Step 4: Check: 9 + 7 = 16, which is correct. The missing number is 7.

3. Liam has 9 toy dinosaurs. His grandma gives him some more toy dinosaurs for his birthday. Now Liam has 16 toy dinosaurs. How many toy dinosaurs did his grandma give him? Answer: 7 Solution: Liam started with 9 toy dinosaurs. After his grandma gave him more, he had 16 toy dinosaurs. To find how many his grandma gave him, subtract the starting amount from the total: 16 - 9 16 - 9 = 7 The answer is 7.
   Full step-by-step solution

   Step 1: Liam started with 9 toy dinosaurs. Step 2: After his grandma gave him more, he had 16 toy dinosaurs. Step 3: To find how many his grandma gave him, subtract the starting amount from the total: 16 - 9 Step 4: 16 - 9 = 7 The answer is 7.

4. Olivia has 9 stickers. Olivia needs 13 stickers in total. How many more stickers does Olivia need to get? Answer: 4 Solution: Olivia has 9 stickers. Olivia needs 13 stickers in total. To find how many more are needed, subtract what Olivia has from what is needed: 13 - 9 = 4.
   Full step-by-step solution

   Step 1: Olivia has 9 stickers. Step 2: Olivia needs 13 stickers in total. Step 3: To find how many more are needed, subtract what Olivia has from what is needed: 13 - 9 = 4. Olivia needs 4 more stickers.

5. 8 + ? = 17 Answer: 9 Solution: Start with the equation 8 + ? = 17 To find the missing number, subtract 8 from 17 17 - 8 = 9 Check: 8 + 9 = 17 The answer is 9.
   Full step-by-step solution

   Step 1: Start with the equation 8 + ? = 17 Step 2: To find the missing number, subtract 8 from 17 Step 3: 17 - 8 = 9 Step 4: Check: 8 + 9 = 17 The answer is 9.

6. Emma has 7 stickers. She wants to have 12 stickers for her sticker book. How many more stickers does Emma need to get? Answer: 5 Solution: Emma starts with 7 stickers. She wants to have 12 stickers total. To find how many more she needs, subtract what she has from what she wants: 12 - 7 12 - 7 = 5 Emma needs 5 more stickers.
   Full step-by-step solution

   Step 1: Emma starts with 7 stickers. Step 2: She wants to have 12 stickers total. Step 3: To find how many more she needs, subtract what she has from what she wants: 12 - 7 Step 4: 12 - 7 = 5 Emma needs 5 more stickers.

7. Jordan has 4 crayons. Jordan finds some more crayons. Now Jordan has 18 crayons. How many crayons did Jordan find? Answer: 14 Solution: Jordan started with 4 crayons. After finding more, Jordan has 18 crayons. The number found is the difference: 18 - 4 = 14.
   Full step-by-step solution

   Step 1: Jordan started with 4 crayons. Step 2: After finding more, Jordan has 18 crayons. Step 3: The number found is the difference: 18 - 4 = 14. Jordan found 14 crayons.

8. Ben has 7 crayons. Ben finds some more crayons. Now Ben has 11 crayons. How many crayons did Ben find? Answer: 4 Solution: Ben started with 7 crayons. After finding more, Ben has 11 crayons. The number found is the difference: 11 - 7 = 4.
   Full step-by-step solution

   Step 1: Ben started with 7 crayons. Step 2: After finding more, Ben has 11 crayons. Step 3: The number found is the difference: 11 - 7 = 4. Ben found 4 crayons.

9. Lily has 8 flowers in her garden. After planting some more flowers, she now has 17 flowers in total. How many flowers did Lily plant? Answer: 9 Solution: Lily started with 8 flowers After planting more flowers, she has 17 total To find how many she planted, subtract the starting amount from the total: 17 - 8 17 - 8 = 9 Lily planted 9 flowers.
   Full step-by-step solution

   Step 1: Lily started with 8 flowers Step 2: After planting more flowers, she has 17 total Step 3: To find how many she planted, subtract the starting amount from the total: 17 - 8 Step 4: 17 - 8 = 9 Lily planted 9 flowers.